JP2003269217A - Method and device for optimizing operation of power device driven by engine and motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To optimize the operating states of driving devices for comprehensively evaluating an electric fee or a fuel cost, an energy consumption, and a quality of energy use method for power equipment such as discharged amount of harmful substances when the power equipment formed of an engine and a motor combined with each other for driving is operated. <P>SOLUTION: Evaluation functions quantitatively indicating the quality are defined, unit consumption data for the functions at that time is obtained by using inputted for detected operating state signals, and the evaluation functions of the drive devices and a composite evaluation function when both drive devices are operated are obtained from the unit consumption data. The operating states of the drive devices are instantaneously automatically controlled so that the composite evaluation function is optimized. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power facility for driving a combination of an engine and an electric motor, and automatically adjusts conditions such as electricity or fuel charges, energy use efficiency, and emission harmful substances to be optimum. Alternatively, the present invention relates to a method and an apparatus for optimizing the operation of a power unit driven by an engine and an electric motor having a function of selecting and operating a drive source that satisfies the above conditions.

[0002]

2. Description of the Related Art The remaining amount of fuel that can be used on the earth has bottomed out, and the problem of environmental pollution represented by global warming has become serious. The ones that use energy are
We must focus on energy use efficiency and energy use methods that take environmental pollution into consideration. Among various types of power equipment, so-called hybrid power equipment driven by both an engine and an electric motor is often used. However, from the viewpoint of energy use efficiency and environmental pollution, it is necessary to select which drive source of the engine or the electric motor should be selected, or what power ratio should be optimal when operating at the same time. Has not been optimized.

[0003]

Since the commercial power source is a combination of various generated power such as nuclear power generation and thermal power generation, when driven by an electric motor, the energy consumption rate and the amount of harmful emissions are changed depending on the time zone. Changes significantly. The present invention comprehensively evaluates the quality of energy utilization method of power equipment such as electricity rate or fuel fee, energy consumption rate, and emission amount of harmful emissions when driving power equipment that drives a combination of an engine and an electric motor. And an operating method characterized by automatically selecting the drive unit to be used and optimizing the operating state of each drive unit so that the evaluation function relating to energy utilization is optimized. It is intended to provide the device.

[0004]

[Means for Solving the Problems] That is, the means for achieving the object are as follows. In Claim 1, it is a method of optimizing the operating state of power equipment that drives a combination of an engine and an electric motor. First, in the case of driving with an engine and an electric motor, respectively, the amount of energy consumed per unit shaft power (hereinafter,
Energy consumption basic unit), energy price per unit shaft power (hereinafter referred to as energy charge basic unit), amount of harmful emissions such as CO2, NOx, SOx emitted per unit shaft power (hereinafter referred to as harmful emission unit) Define the evaluation function that quantitatively expresses the "quality" of the energy usage method from the unit), and from the input or detected operating state signal,
Obtain each of the basic unit data at that time,
From these basic unit data, the evaluation function of each drive unit and the combined evaluation function when operating with both drive units are obtained, and the operating state of each drive unit is instantaneously and automatically adjusted so that the combined evaluation function is optimized. A method for optimizing the operating state of power equipment that drives a combination of an engine and an electric motor.

2. As an index showing the quality of the energy utilization method in claim 1, the evaluation function when driven by the engine and the electric motor is defined as follows. F = Q x (A1 x P1 + A2 x P2 + A3 x P3 + A4 x P4 + A5 x P5) However, F: Evaluation function Q: Energy consumption (KWH) A1: Coefficient for power rate evaluation P1: Electric power or fuel cost basic unit (yen / KWH) ) A2: Coefficient for energy consumption rate evaluation P2: Energy consumption basic unit (crude oil equivalent KL / KWH) A3: CO2 emission rate evaluation coefficient P3: CO2 emission basic unit (g / KWH) A4: SOx emission rate evaluation P4: SOx emission intensity (g / KWH) A5: NOx emission rate evaluation factor P5: NOx emission intensity (g / KWH) The parameters are not limited to those listed here. Absent.

3. In claim 1, the evaluation function when driven by both the engine and the electric motor is obtained by combining these. As a method of automatically correcting this synthetic evaluation function to the best condition, the engine or electric motor controller is equipped with a simulator called observer as described below. The operation of this observer will be described below.
This observer constantly simulates a synthetic evaluation function for all operating conditions of the power plant, and calculates input conditions and parameters for which the synthetic evaluation function is optimal for the engine and the electric motor. The calculation result is sent to the control device of the engine or the electric motor, and the input condition and the parameter are automatically corrected by this command. Since this correction operation is instantaneously performed, the combined evaluation function always has the optimum value, and the operation in the optimum state is always secured.

4. The amount of fuel consumed per unit shaft output when each drive device is operated in the optimization device for operation of a power unit driven by an engine and an electric motor (hereinafter, fuel consumption basic unit) ,
Energy price used per unit shaft output (hereinafter, energy unit price), CO emitted per unit shaft power
2. A means for calculating the amount of harmful emissions such as NOx and SOx (hereinafter referred to as “hazardous emission intensity unit”) is provided, and these values are used to quantitatively express the “quality” of the power generation method. A function is defined, and means is provided for obtaining an evaluation function when operating with each drive device in that state from the input or detected operating state signal, and the drive device with a better evaluation function is automatically provided from the means. It is an optimizing device for driving a power unit driven by an engine and an electric motor, which is characterized by being selectively operated.

5. In Claim 3, when the power unit driven by the engine and the electric motor operates, the amount of fuel consumed per unit shaft output (hereinafter, fuel consumption basic unit) when operating the respective drive units, unit shaft A unit calculation unit that calculates the energy price used per output (hereinafter referred to as "energy unit rate") and the amount of harmful emissions such as CO2, NOx, SOx emitted per unit shaft power (hereinafter referred to as "hazardous unit rate") And an evaluation function calculator that calculates an evaluation function that quantitatively expresses the "quality" of the power generation method using these values, and from the input or detected operating state signal, in both drive units in that state A synthetic evaluation function calculation unit that obtains a synthetic evaluation function when operating, and a simulation calculation of conditions to optimize the synthetic evaluation function, and automatically corrects the engine output and the motor output. An apparatus for optimizing the operation of a power unit driven by an engine and an electric motor, characterized by comprising an automatic correction command section.

6. In Claim 4, when the power unit driven by the engine and the electric motor is operated, the amount of fuel consumed per unit shaft output when the respective drive units are operated (hereinafter, fuel consumption basic unit), unit Evaluation function calculation that calculates the energy price used per shaft output (hereinafter, energy unit consumption), and the amount of harmful emissions such as CO2, NOx, SOx, etc. emitted per unit shaft power (hereinafter, harmful emission basic unit) Section, an evaluation function calculation section that calculates an evaluation function that quantitatively expresses the "quality" of the power generation method using these values, and each drive device in that state from the input or detected operating state signal For an engine and an electric motor characterized by being configured from an evaluation function comparison calculation unit that automatically obtains an evaluation function when operating in It is an optimizing device for the operation of a power unit driven more. An embodiment of the present invention will be described in detail below with reference to the drawings.

[0010]

FIG. 1 is a block diagram for explaining an embodiment of the first aspect of the present invention, which is an example in which this principle is applied to an air conditioning compressor driven by a gas engine and an electric motor. In FIG. 1, 1 is an air conditioning compressor, 2 is an electric motor, and 3 is a gas engine, which are installed coaxially. This compressor can also combine and drive the power of both the gas engine and the motor,
You can drive either one. Reference numeral 4 is an evaluation function operation unit when the compressor is driven by the motor, 5 is an evaluation function operation unit when the compressor is driven by the engine, and 7
Is an operation unit for these combined evaluation functions, and 8 is an observer unit for simulating the combined evaluation functions for various conditions and issuing an automatic correction command for the engine output.

As described above, the evaluation function when the air conditioner is driven by the motor varies greatly with time,
The value of the evaluation function of the engine and motor reverses day and night. Therefore, it is not always easy to determine at what ratio the engine output and the motor output should be operated, especially in the middle thereof.

Therefore, in the present invention, the instantaneous instantaneous synthetic evaluation function is calculated, and at the same time, the observer unit 8 constantly simulates the synthetic evaluation function for all operating conditions of the power plant to evaluate the synthetic evaluation of the engine and the electric motor. We are calculating the input conditions and parameters that make the function optimal. The result of this calculation is sent to the fuel adjustment device 6 of the engine and adjusted so as to obtain the optimum fuel amount.

In this embodiment, only the fuel of the engine is adjusted in order to optimize the synthetic evaluation function. However, if the electric motor has a function such as a transmission that can change the synthetic evaluation function, the electric motor can be changed. It is also possible to adjust the speed change device and the like.

The following equations were used as evaluation functions when the compressor was driven by the engine or the electric motor. F = Q x (A1 x P1 + A2 x P2 + A3 x P3 + A4 x P4 + A5 x P5) However, F: Evaluation function Q: Energy consumption (KWH) A1: Coefficient for power rate evaluation P1: Electric power or fuel cost basic unit (yen / KWH) ) A2: Coefficient for energy consumption rate evaluation P2: Energy consumption basic unit (crude oil equivalent KL / KWH) A3: CO2 emission rate evaluation coefficient P3: CO2 emission basic unit (g / KWH) A4: SOx emission rate evaluation P4: SOx emission intensity (g / KWH) A5: NOx emission rate evaluation factor P5: NOx emission intensity (g / KWH) The published value was used.

The observer is as follows. That is, a simulation function is provided for the engine drive system and the electric motor drive system, and the synthetic evaluation function for the fuel injection amount of the engine is simulated and calculated. The observer is sent the synthetic evaluation function at the present moment from moment to moment, but if this synthetic evaluation function is not the optimum value, the engine is instructed with the optimum fuel injection amount of the engine obtained by simulation calculation. Then, the output of the engine is adjusted to optimize the synthetic evaluation function.

In the embodiment of this equipment, the nighttime electric power is cheap due to the seasonal hourly contract. Comparing the evaluation functions by time, it is advantageous to use the commercial power supply at night and to drive the engine during the daytime. FIG. 2 shows an example of the result of operation for about one month using this evaluation function system. The engine is operated during the daytime, the motor is operated during the nighttime, and both the motor and the engine are driven during the intermediate time. It is difficult to artificially issue these commands, and the importance of automatic detection of the optimum drive source was confirmed.

[0017]

As described above, according to the present invention, in the combination of the engine and the electric motor, it is possible to operate at an almost optimum point, and it is possible to greatly reduce the electricity bill, but it is possible to simply reduce the electricity bill. Not only that, it also enables driving with good environmental friendliness. While energy problems and environmental problems are becoming serious, the present invention is very useful for solving these problems and is extremely useful in practice.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining an embodiment of the present invention.

FIG. 2 is a diagram showing a drive source selected at each time, as an example of an operation result of a main operation.

[Explanation of symbols]

1 compressor 2 motor 3 engine 4 Motor drive evaluation function calculator 5 Engine-driven evaluation function calculator 6 Fuel adjustment device 7 Synthetic evaluation function calculator 8 Observer 9 motors 10 engine

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor ▲ Taka ▼ Tree Ikuo             3-6-15 Nakajujo, Kita-ku, Tokyo Limited company ▲             Taka ▼ Within the tree design F-term (reference) 3G084 BA02 DA02 DA10 EC04 FA13                       FA28                 3G093 AA07 AA16 BA19 BA20 DA08                       DA11 EA02 EC02

Claims (4)

[Claims] 1. A method of optimizing the operation of a power unit driven by an engine and an electric motor, wherein the amount of fuel consumed per unit shaft output and the energy used per unit shaft output when the respective drive units are operated. Calculate the amount of harmful emissions such as CO2, NOx, SOx, etc., that are emitted per price and unit shaft power, and use these values to define an evaluation function that quantitatively expresses the "quality" of the power generation method. From the detected operating state signal, the synthetic evaluation function when driving with both drive devices in that state is obtained, and the engine output and the motor output are automatically corrected so that the synthetic evaluation function is optimal. A method for optimizing the operation of a power unit driven by an engine and an electric motor. 2. In an optimizing device for driving a power unit driven by an engine and an electric motor, the amount of fuel consumed per unit shaft output and the energy used per unit shaft output when each drive unit is operated. An evaluation function that quantitatively expresses the "quality" of the power generation method by providing means for calculating the amount of harmful emissions such as CO2, NOx, SOx, etc., that are emitted per unit of price and unit shaft power. Is provided, and means for obtaining an evaluation function when operating with each drive device in that state from the input or detected operating state signal is provided, and from this means, the drive device with the better evaluation function is automatically provided. A device for optimizing the operation of a power unit driven by an engine and an electric motor, which is selected and operated. 3. When a power unit driven by an engine and an electric motor is operated, an amount of fuel consumed per unit shaft output when each drive unit is operated, an energy price used per unit shaft output, A unit calculation unit that calculates the amount of harmful emissions such as CO2, NOx, and SOx emitted per unit shaft power, and an evaluation function that quantitatively expresses the "quality" of the power generation method using these values. An evaluation function operation unit, a combined evaluation function operation unit that obtains a combined evaluation function when operating with both drive devices in the state from an input or detected operating state signal, and the combined evaluation function is optimized. Power driven by an engine and an electric motor characterized by being configured from an automatic correction command unit that automatically calculates the output of the engine and the output of the electric motor by simulating conditions Optimization system of operation of the location. 4. When a power unit driven by an engine and an electric motor is operated, an amount of fuel consumed per unit shaft output when each drive unit is operated, an energy price used per unit shaft output, An evaluation function calculator that calculates the amount of harmful emissions such as CO2, NOx, and SOx emitted per unit shaft power, and an evaluation function that quantitatively represents the "quality" of the power generation method using these values. From the evaluation function calculator and the input or detected operating status signal,
In that state, an engine characterized by comprising an evaluation function comparison operation part for obtaining an evaluation function when operating with each drive device and automatically selecting and operating the drive device with the better evaluation function, A device for optimizing the operation of a power unit driven by an electric motor.